CN113338992A - Construction process of tunnel portal arch protection section soil mould - Google Patents
Construction process of tunnel portal arch protection section soil mould Download PDFInfo
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- CN113338992A CN113338992A CN202110677388.9A CN202110677388A CN113338992A CN 113338992 A CN113338992 A CN 113338992A CN 202110677388 A CN202110677388 A CN 202110677388A CN 113338992 A CN113338992 A CN 113338992A
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- 239000002689 soil Substances 0.000 title claims abstract description 73
- 238000010276 construction Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 90
- 239000010959 steel Substances 0.000 claims abstract description 90
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 35
- 239000011159 matrix material Substances 0.000 claims abstract description 17
- 230000001012 protector Effects 0.000 claims abstract description 7
- 239000004927 clay Substances 0.000 claims abstract description 4
- 239000004568 cement Substances 0.000 claims description 11
- 239000004567 concrete Substances 0.000 claims description 10
- 239000002023 wood Substances 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 7
- 238000009966 trimming Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000004746 geotextile Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims 2
- 238000009434 installation Methods 0.000 abstract description 3
- 238000009412 basement excavation Methods 0.000 description 7
- 238000009415 formwork Methods 0.000 description 4
- 210000003205 muscle Anatomy 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 239000002649 leather substitute Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/102—Removable shuttering; Bearing or supporting devices therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a tunnel portal arch protection section soil matrix construction process, which relates to the technical field of tunnel construction and comprises the following steps: constructing and finishing an internal mold of a soil tyre, constructing a foot locking steel pipe, binding an arch protection foundation and reinforcing steel bars, installing an external template, pouring an arch protection, detaching the external template, maintaining, tamping earth and filling earthwork, filling a clay water-resisting layer and a planting soil layer. The earth is backfilled in the gap of the arch protection section to form the earth inner mold, so that the construction is simple and convenient, and the operation is easy; and a locking assembly is drilled and fixedly connected with soil at the arch springing to ensure that the locking assembly is connected with the formed arch protector into a whole. According to the invention, the arch protection arch wall reinforcing steel bars are directly bound outside the soil tire internal mold, so that the installation time of the steel frame is reduced, the phenomenon that the steel frame is over-limit or the appearance quality inside and outside the tunnel is unqualified in subsequent construction is avoided, the construction process can be simplified, the tunnel entering time is saved, the construction period is shortened, and the construction cost is saved.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a tunnel portal arch protection section soil matrix construction process.
Background
The conventional construction process for shallow-buried biased tunneling of the tunnel generally adopts a construction method of back-pressure backfilling soil or reducing excavation of an open face, such as a four-step CD method, a crossed middle partition wall method and the like, and the conventional construction process has the uncontrollable defects of low construction speed, complex process, high construction risk and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a tunnel portal arch protection section soil matrix construction process aiming at the defects of the prior art, the stability of the whole arch protection can be better by connecting the steel arch frame and the arch protection into a whole, the subsequent construction process can be simplified, and the workload is reduced.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a tunnel portal arch protection section soil matrix construction process comprises the following steps:
s1, constructing an internal mold of the soil tire: backfilling earthwork at the gap of the arch protection section, rolling and compacting, and trimming the soil body into a soil matrix with the shape and the size of the arch protection internal mold;
s2, trimming the soil inner mould and paving an isolation film;
s3, construction of the lock leg steel pipe: drilling foot locking steel pipes at arch feet on two sides of the arch protector and grouting;
s4, arch protection foundation construction and arch protection arch wall reinforcement binding: binding arch springing reinforcing steel bars and pouring concrete to form an arch protection foundation, and binding arch centering reinforcing steel bars on the inner mould of the soil tyre;
s5, installing an arch protection outer template: assembling a wood plate outside the arch protection arch wall reinforcing steel bars to form an outer template;
s6, arch protection pouring:
s7, removing the outer template;
s8, maintaining;
s9, tamping the earthwork;
s10, filling clay water-resisting layer and planting soil layer.
Preferably, in step S1, the backfill soil is undisturbed soil or improved soil, and the improved soil is 5% cemented soil.
Preferably, in step S2, the deviation of the inner mold contour of the soil tire is controlled within 2 cm.
Preferably, in step S3, the lock pin steel tubes are arranged at intervals in the length direction of the arch guard, each group of lock pin steel tubes includes two steel tubes which are at a certain included angle and are drilled obliquely below the outer side of the arch pin, and the steel tubes are filled with cement slurry.
Preferably, the diameters of the two steel perforated pipes are phi 89mm, the inclination angles of the two steel perforated pipes are 15 degrees and 30 degrees respectively, and the longitudinal spacing distance of the steel perforated pipes along the retaining arch is 0.5 m; the length of the steel perforated pipe is 6.0m, the wall thickness is 6mm, and the upper end of the steel perforated pipe extends to the inside of the arch protection foundation by 25cm and is used for being connected with the arch protection into a whole.
Preferably, the arch frame positioning steel bars and the arch springing steel bars are bound by arch protection main bars, distribution bars and stirrups; the outer part of the arch frame positioning steel bar is provided with an arch frame circumferential positioning steel bar; and exposed connecting ribs are arranged on the arch springing reinforcing steel bars and the arch frame positioning reinforcing steel bars in the arch protection foundation.
Preferably, the main reinforcement of the arch protection adopts the steel bar interval of HRB400 phi 22mm and the layer interval of 20cm, the distribution reinforcement adopts the steel bar interval of HRB400 phi 16mm and the layer interval of 25cm, and the stirrup adopts the steel bar of HRB 300 phi 10 mm.
Preferably, in step S5, the outer formworks are installed symmetrically from two sides of the protective arch; and the outer part of the outer template is provided with two reinforcing steel bar hoops which can be connected with embedded parts in the arch protection foundation and arch frame annular positioning reinforcing steel bars and are used for fixing the outer template.
Preferably, in step S5, the outer form is provided with a plurality of horizontal steel pipes at intervals at the arch springing position for supporting the root of the outer form.
Preferably, the thickness of a single wood board of the outer template is 5cm, the width of the single wood board is 30cm, and geotextile for blocking concrete leakage is arranged between two adjacent wood boards; the number of the horizontal steel pipes at the root of the outer template is three, the height of the uppermost horizontal steel pipe is 3.0m, and the two lower horizontal steel pipes are sequentially spaced by 0.6-1.0m downwards.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with the prior art, the invention forms the soil matrix inner mold by backfilling earthwork at the gap of the arch protection section, and constructs arch protection arch wall reinforcing steel bars and lays an outer template outside the soil matrix inner mold in sequence; meanwhile, the arch protection foundation is fixedly connected with the soil body at the arch springing position through a drilling locking assembly, so that the arch protection foundation is ensured to be connected with the formed arch protection into a whole. The method has the characteristics of simple construction and easy operation, reduces the installation time of the steel frame by directly binding the arch protection arch wall reinforcing steel bars outside the soil tire internal mold, avoids the phenomenon that the steel frame exceeds the limit or the appearance quality inside and outside the tunnel is unqualified in subsequent construction, can simplify the construction process, saves the tunnel entering time, shortens the construction period and saves the construction cost.
Drawings
Fig. 1 is a schematic structural diagram of an internal mold of an earth tire in an earth tire mold construction process of an arch protection segment of a tunnel portal according to an embodiment of the present invention;
FIG. 2 is a state diagram after completion of an arch protector in the embodiment of the present invention;
FIG. 3 is an A-direction view of an outer template in an embodiment of the present invention;
FIG. 4 is a cross-sectional view I-I of the arch positioning bar of FIG. 2;
FIG. 5 is a sectional view II-II of the arch reinforcement of FIG. 2;
in the figure: 00-arch protection; 1-arch protection foundation; 2-arch protection internal mold, 21-primary support steel arch frame, 22-mesh sheet; 3-arch protection arch wall reinforcing steel bars, 301-arch frame positioning reinforcing steel bars, 302-arch springing reinforcing steel bars, 30-arch protection main reinforcing steel bars, 31-distribution reinforcing steel bars, 32-stirrups and 33-connection reinforcing steel bars; 4-external template; 5-locking the steel pipe; 6-a steel bar hoop; 7-horizontal steel pipes; 8-full hall bracket.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In a certain high-speed railway double-track tunnel, the topography at the exit is relatively slow, and for shallow buried bias voltage, and the up slope of the hidden tunnel entry position is high and steep again, geological conditions: early stage granite of Yanshan mountain. The total weathering layer is about 10.0-30.0 m thick, is hard and plastic, belongs to grade III hard soil, and has multiple layers of strong weathering rock layers and weak weathering rock layers with the thickness of 0.5-2.0 m due to differential weathering; the highly weathered layer is in a shape of a broken block and a pebble and belongs to IV-grade soft rock; the weakly weathered layer belongs to grade V hard stone. Therefore, the intersection section of the open cut tunnel and the underground tunnel at the outlet is designed to adopt open cut tunnel underground excavation and arrangement of a reinforced concrete arch protector 15m, the thickness of the arch protector is 60cm, and the angle is 180 degrees (semicircular). The arch protection is constructed by adopting the steel framework structure provided by the invention.
As shown in fig. 1-3, the construction process of the soil matrix of the tunnel portal arch protection segment provided by the invention comprises the following steps:
s1, constructing the soil tire inner mold 2: and backfilling earthwork at the gap of the arch protection section, rolling and compacting, and trimming the soil body into a soil tire with the shape and the size of the arch protection internal mold. Wherein, the backfilling can be undisturbed soil or improved soil, and the improved soil is soil doped with 5% of cement. The cement and soil are mixed well in advance before construction, and then backfilling is carried out, and a soil body is trimmed into a soil body with the shape and the size of the arch protection internal mold, so that the soil body internal mold can be formed.
In view of the fact that a guide wall and a large pipe shed need to be constructed before tunnel arch protection construction, and the arch protection surface soil tire is damaged, 5% cement soil is adopted for improvement on site. The concrete method is that after the construction of the large pipe shed is finished, 5% of cement soil is adopted to backfill, roll and compact the gap of the arch protection section excavated during the construction of the pipe shed, an arch protection soil inner mold is refitted by manually matching with machinery, and then reinforced concrete construction of the arch protection 00 is carried out. Wherein, 5% of cement in the cement-modified soil: the mass ratio of the soil is 5: 100.
S2, trimming the soil inner mould 2 and paving an isolation film: and (4) manually finishing the internal mold of the soil tire, and controlling the deviation of the contour line of the internal mold 2 of the soil tire within 2 cm. The tunnel arch protection construction lofting mainly comprises lofting of a plane position and a contour line, wherein the plane position lofting is used for accurately positioning an arch protection center line and an arch foot side line by using a total station when an arch is protected, the contour line lofting is used for calculating an inner contour line of the arch protection from the arch top to the arch foot by using the total station according to the circumferential direction of 0.5m and the longitudinal direction of 1m, and the deviation of the inner contour line is strictly controlled within 2cm along with excavation and rechecking. According to the contour line of the retaining arch structure determined by measuring and setting-out, earth excavation is carried out mainly by means of an excavator, manual excavation is changed into manual excavation when the distance from the top surface of the inner arc of the retaining arch is 10-20 cm, foundation tamping is carried out, and the forming surface of the inner mold of the retaining arch earth tire is trimmed and formed.
After finishing, an artificial leather isolating membrane is laid outside the soil inner mould 2, so that the phenomenon of slurry leakage of the subsequent arch protection pouring concrete is avoided.
S3, construction of the lock leg steel pipe 5: and drilling and arranging locking steel pipes 5 at arch springing positions on two sides of the arch protector and grouting. As shown in fig. 1 and 2, the locking steel pipes 5 are two steel pipes 50 capable of being filled with cement paste, every two steel pipes 50 are drilled at the arch springing positions at two sides of the arch guard 00, and the two steel pipes 50 are arranged in an inverted V shape and are drilled towards the oblique lower part of the outer side of the arch springing; the upper end of the steel perforated pipe 50 is embedded in the arch protection foundation 1. During specific design, the diameters of the two steel perforated pipes are phi 89mm, the inclination angles of the two steel perforated pipes are respectively 15 degrees and 30 degrees, the steel perforated pipes are longitudinally arranged along the retaining arch at intervals, and the distance between every two adjacent steel perforated pipes is 0.5 m; the length of the steel perforated pipe is 6.0m, the wall thickness is 6mm, and the upper end of the steel perforated pipe extends to the inside of the arch protection foundation by 25cm and is used for being connected with the arch protection into a whole. After arch springing excavation forming of the retaining arch, a down-the-hole drill is used for longitudinally arranging 0.5 m/position according to the sequence from inside to outside, 2 phi 89 locking steel pipes are arranged in each group according to the angle of 15 degrees and 30 degrees, the upper end of each steel flower pipe extends into the retaining arch foundation, and the steel flower pipes can be guaranteed to be connected with the forming retaining arch into a whole. The water-cement ratio of cement slurry poured into the steel flower tube is as follows: 1:1 (weight ratio), grouting pressure: 0.5 to 2.2 MPa.
S4, constructing an arch protection foundation 1 and binding arch protection arch wall reinforcing steel bars 3: binding arch springing reinforcing steel bars 302, pouring concrete to form an arch protection foundation 1, and binding arch centering reinforcing steel bars 301 on the soil tire inner mold 2.
As shown in fig. 4 and 5, the arch frame positioning steel bars 301 and the arch springing steel bars 302 are bound by the arch protection main bars 30, the distribution bars 31 and the stirrups 32; the exterior of the arch centering steel bar 301 is provided with an arch centering circumferential positioning steel bar (not shown in the figure); the arch springing reinforcing steel bars 302 and the arch centering reinforcing steel bars 301 are provided with exposed connecting ribs 33. Wherein, the main muscle 30 of fender arch adopts HRB400 phi 22mm reinforcing bar interval 20cm, layer apart from 50cm, and the inlayer and inlayer protects the distance of encircleing main muscle 30 and be 600mm, distribution muscle 31 adopts HRB400 phi 16mm reinforcing bar interval 25cm, and distribution muscle 31's width is 458mm, stirrup 32 adopts HRB 300 phi 10mm reinforcing bar. The arch springing reinforcing steel bars in the arch protection foundation and the exposed connecting ribs of the arch frame positioning reinforcing steel bars of the arch wall are not less than 35d, and the connecting mode adopts welding. The two ends of the arch frame positioning steel bar are fixedly connected with the reserved connecting ribs of the arch springing, and the arch frame annular positioning steel bar is bound outside the arch frame positioning steel bar to form the arch protection arch wall steel bar.
S5, installing an arch protection outer template 4: and assembling a wood plate outside the arch protection arch wall reinforcing steel bars 3 to form an outer template 4.
As shown in fig. 1 and 3, the outer formwork 4 is formed by assembling a plurality of wood boards, and the outer formwork 4 is installed symmetrically from two sides of the protective arch in the circumferential direction; the outer part of the outer template 4 is provided with two reinforcing steel bar hoops 6 which can be connected with embedded parts and arch frame circumferential positioning reinforcing steel bars in the arch protection foundation 1 and are used for fixing the outer template 4; the root of the steel bar hoop 6 is welded and connected with an embedded part in the arch protection foundation 1, the embedded part is a steel bar with the embedded length of 1.0mHRB phi 22, and is embedded into the steel bar hoop by 80cm and exposed out by 20 cm; and meanwhile, a plurality of horizontal steel pipes 7 are arranged at intervals in the range that the root of the outer template 4 at the arch springing position is 3.0m high and are used for supporting the root of the outer template 4 and reinforcing the outer template.
Wherein, the thickness of a single wood board of the outer template 4 is 5cm, the width is 20cm, and the length is 4-6.0 m; and a geotextile for blocking concrete leakage is arranged between two adjacent wood boards. In view of the concrete placement, because of having the small space between the plank of exterior sheathing and the plank, easily leak thick liquid, when concreting, carry out the leaking stoppage with materials such as geotechnological cloth, can prevent because of leaking the thick liquid, influence concrete quality.
The number of the horizontal steel pipes 7 at the root of the outer formwork 4 is three, the height of the uppermost horizontal steel pipe 7 is 3.0m, and the two lower horizontal steel pipes 7 are sequentially spaced from each other by 0.6-1.0 m.
S6, arch protection pouring:
s7, removing the outer template 4;
s8, maintaining;
s9, tamping the earthwork;
s10, filling clay water-resisting layer and planting soil layer.
In conclusion, the improved soil is backfilled in the arch protection gap to serve as the arch protection internal mold, the arch protection arch wall reinforcing steel bars are sequentially constructed outside the soil tire internal mold, and the external template is laid, so that the installation time of the steel frame is reduced, and the phenomenon that the steel frame is over-limit or the appearance quality inside and outside the tunnel is unqualified in subsequent construction is avoided; meanwhile, the arch protection foundation is fixedly connected with the soil body at the arch springing through a steel pipe with a drilled locking leg, so that the arch protection foundation is ensured to be connected with the formed arch protection into a whole. The method has the characteristics of simple and convenient construction and easy operation, can simplify the construction process, save the hole entering time, shorten the construction period, save the construction cost and is convenient to popularize and apply.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A tunnel portal arch protection section soil matrix construction process is characterized by comprising the following steps:
s1, constructing an internal mold of the soil tire: backfilling earthwork at the gap of the arch protection section, rolling and compacting, and trimming the soil body into a soil matrix with the shape and the size of the arch protection internal mold;
s2, trimming the soil inner mould and paving an isolation film;
s3, construction of the lock leg steel pipe: drilling foot locking steel pipes at arch feet on two sides of the arch protector and grouting;
s4, arch protection foundation construction and arch protection arch wall reinforcement binding: binding arch springing reinforcing steel bars and pouring concrete to form an arch protection foundation, and binding arch centering reinforcing steel bars on the inner mould of the soil tyre;
s5, installing an arch protection outer template: assembling a wood plate outside the arch protection arch wall reinforcing steel bars to form an outer template;
s6, arch protection pouring:
s7, removing the outer template;
s8, maintaining;
s9, tamping the earthwork;
s10, filling clay water-resisting layer and planting soil layer.
2. The tunnel portal arch protection section soil matrix construction process according to claim 1, characterized in that: in step S1, the backfilled earth is undisturbed soil or improved soil, and the improved soil is 5% cement soil.
3. The tunnel portal arch protection section soil matrix construction process according to claim 1, characterized in that: in step S2, the deviation of the contour line in the earth tyre is controlled within 2 cm.
4. The tunnel portal arch protection section soil matrix construction process according to claim 1, characterized in that: in step S3, the lock leg steel tubes are arranged at intervals along the length direction of the arch guard, each group of lock leg steel tubes includes two steel tubes which are arranged at a certain included angle and are drilled obliquely below the outer side of the arch leg, and the steel tubes are filled with cement slurry.
5. The tunnel portal arch protection section soil matrix construction process according to claim 4, characterized in that: the diameters of the two steel perforated pipes are phi 89mm, the inclination angles of the two steel perforated pipes are 15 degrees and 30 degrees respectively, and the longitudinal spacing distance of the steel perforated pipes along the retaining arch is 0.5 m; the length of the steel perforated pipe is 6.0m, the wall thickness is 6mm, and the upper end of the steel perforated pipe extends to the inside of the arch protection foundation by 25cm and is used for being connected with the arch protection into a whole.
6. The tunnel portal arch protection section earth moulding construction process according to any one of claims 1 to 5, characterized in that: the arch frame positioning steel bars and the arch springing steel bars are bound by arch protection main bars, distribution bars and stirrups; the outer part of the arch frame positioning steel bar is provided with an arch frame circumferential positioning steel bar; and exposed connecting ribs are arranged on the arch springing reinforcing steel bars and the arch frame positioning reinforcing steel bars in the arch protection foundation.
7. The tunnel portal arch protection section soil matrix construction process according to claim 6, characterized in that: the main reinforcement of the arch protection adopts the steel bar interval of HRB400 phi 22mm to be 20cm and the layer distance to be 50cm, the distribution reinforcement adopts the steel bar interval of HRB400 phi 16mm to be 25cm, and the stirrup adopts the steel bar of HRB 300 phi 10 mm.
8. The tunnel portal arch protection section soil matrix construction process according to claim 1, characterized in that: in step S5, the outer templates are annularly and symmetrically arranged at two sides of the self-protection arch; and the outer part of the outer template is provided with two reinforcing steel bar hoops which can be connected with embedded parts in the arch protection foundation and arch frame annular positioning reinforcing steel bars and are used for fixing the outer template.
9. The tunnel portal arch protection section soil matrix construction process according to claim 8, characterized in that: in step S5, the outer form is fitted with a plurality of horizontal steel pipes at intervals at the arch springing positions for supporting the root of the outer form.
10. The tunnel portal arch protection section earth moulding construction process according to claim 9, characterized in that: the thickness of a single board of the outer template is 5cm, the width of the single board is 30cm, and geotextile for blocking concrete leakage is arranged between two adjacent boards; the number of the horizontal steel pipes at the root of the outer template is three, the height of the uppermost horizontal steel pipe is 3.0m, and the two lower horizontal steel pipes are sequentially spaced by 0.6-1.0m downwards.
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| 张衍林: "农村能源实用新技术", 湖北科学技术出版社, pages: 55 * |
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